Add DAST, graph modules, toast notifications, and dashboard enhancements

Add DAST scanning and code knowledge graph features across the stack:
- compliance-dast and compliance-graph workspace crates
- Agent API handlers and routes for DAST targets/scans and graph builds
- Core models and traits for DAST and graph domains
- Dashboard pages for DAST targets/findings/overview and graph explorer/impact
- Toast notification system with auto-dismiss for async action feedback
- Button click animations and disabled states for better UX

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

compliance-graph/Cargo.toml

@@ -0,0 +1,37 @@
+[package]
+name = "compliance-graph"
+version = "0.1.0"
+edition = "2021"
+
+[lints]
+workspace = true
+
+[dependencies]
+compliance-core = { workspace = true, features = ["mongodb"] }
+serde = { workspace = true }
+serde_json = { workspace = true }
+chrono = { workspace = true }
+thiserror = { workspace = true }
+tracing = { workspace = true }
+uuid = { workspace = true }
+tokio = { workspace = true }
+mongodb = { workspace = true }
+
+# Tree-sitter parsing
+tree-sitter = "0.24"
+tree-sitter-rust = "0.23"
+tree-sitter-python = "0.23"
+tree-sitter-javascript = "0.23"
+tree-sitter-typescript = "0.23"
+
+# Graph algorithms
+petgraph = "0.7"
+
+# Text search
+tantivy = "0.22"
+
+# Serialization
+bson = "2"
+
+# Async streams
+futures-util = "0.3"